Thanks Rahul!
Jorge Moratinos > Date: Thu, 24 Jun 2010 16:35:34 -0400 > Subject: Re: FW: [SCXML] Some questions about the use of a state machine > developed with SCXML > From: [email protected] > To: [email protected] > > On Wed, Jun 23, 2010 at 8:11 AM, Jorge Moratinos <[email protected]> > wrote: > > > > > > Hi, > > > > I've some questions about scxml, I'm developing an state machine, but in > > some cases I called from SCXML a Custom Action, and that Custom Action must > > be running undergroud and sending new events. My questions are: > > > > > > How can i send new events to the same state machine from the custom Actions? > > > <snip/> > > The easiest way is to add an event to the internal event queue (or > derived events). > > > > What are the derivedEvents? > > > <snap/> > > As a side-effect of processing an external events, executable content > may generate internal events to be handled in subsequent processing > steps. Thus, they are said to be derived as part of the reactive > behavior in response to other external events. > > > > It's posible call a custom action and let the state machine and the custom > > action running at the same time? > > > <snip/> > > Actions are supposed to execute fairly quickly (in theory, they must > execute in negligible time). Therefore, it is not recommend to have > long running custom actions. However, the significance of the time > required to process actions on the "health" of the state machine > execution depends on the usecase and expected frequency of external > events. > > While the execution of the action itself should be fairly quick, an > action may initiate long running processing (for example, by spawning > another thread). However, in general, in such cases, the semantics > align more with "do while" rather than "on entry/exit/transition" and > therefore, the SCXML <invoke> construct may be more appropriate than a > custom action. The semantics of <invoke> are more aligned with an > "activity" to be performed while in a state, rather than an action. > > -Rahul > > > > thanks, > > > > Jorge Moratinos > > [email protected] > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > _________________________________________________________________ Los cochazos de los famosos Patrick Dempsey, Tom Cruise o Michael Douglas presumen de automóvil http://motor.es.msn.com/coches/galeria.aspx?cp-documentid=152634169
